Classification of Plants
NatureServe Explorer reports vascular plant, nonvascular plant, and lichen names as accepted by NatureServes standard references, which represent the consensus standards for researchers working in a given geographic area. Plant and lichen taxa newly described in the published scientific literature after the publication of the relevant standard reference (i.e. taxa neither accepted nor rejected by the standard) are also reported if they have a validly published scientific name. NatureServe Explorer also reports plant and lichen names not accepted in the standard reference that have status assigned under the U.S. Endangered Species Act or by the Committee on the Status of Endangered Wildlife in Canada. The selected non-lichenized fungi that are displayed are described by a variety of credible sources (indicated in the Concept Reference field for each species) rather than a single standard reference.
Standard References for Vascular Plants
Records provided through NatureServe Explorer are currently being revised in accordance with:
Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, JT and CA Meacham. Synthesis of the North American flora [computer program]. Version 1.0. North Carolina Botanical Garden: Chapel Hill, NC.
Records not yet revised were classified in accordance with:
Kartesz J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd ed. 2 vols. Portland, (OR): Timber Press.
Standard References for Nonvascular Plants and Lichens
Anderson L.E., Crum H.A., Buck W.R. 1990. List of the mosses of North America north of Mexico. The Bryologist 93(4):448-499.
Anderson L.E. 1990. A checklist of sphagnum in North America north of Mexico. The Bryologist 93(4):500-501.
Esslinger T.L., Egan R.S. 1995. A sixth checklist of the lichen-forming, lichenicolous, and allied fungi of the continental United States and Canada. The Bryologist 98(4):467-549.
Stotler R., Crandall-Stotler B. 1977. A checklist of the liverworts and hornworts of North America. The Bryologist 80(3):405-428.
Stotler, R. E. and B. Crandall-Stotler. 2005. A revised classification of the Anthocerotophya and a checklist of the Hornworts of North America, north of Mexico. Bryologist 108(1): 16-26.